Recessing toolholder for automatic machines



3 Sheets-Sheet 1 June 8, 1954 R. c. ZELLER Erm.

REcEssING TooLHoLDER FOR AUTOMATIC MACHINES Filed Nov. 28, 1952 ATTORNEYS June 8, 1954 R. C. ZELLER ET AL RECESSING TOOLHOLDER FOR AUTOMATIC MACHINES Filed Nov. 28, 1952 Jil MAc'H/N/s FRAME 5714 TIO/VARY 3 Sheets-Sheet 2 MAIN T001. .SL/0E INVENTORS ATTORNEYS June 8, 1954 R. c; zELLER TAL 2,680,389

RECESSING TOOLHOLDER FOR AUTOMATIC` MACHINES Filed Nov. 28, 1952 3 Sheets-Sheet 5 ATTO PN EYS Patented June -8, 1954 RECES'SING T00 HOLDER FOR .AUTQMA'HC MACHINES Robert C. Zellerand Louis J. Kimpel, Defiance,

Ohio, assignors to The Zeller-Corporation", Del. fiance, Ohio, a corporation ofpOho Application November 28, 19,52, Serial No. gg, 9,42

(Cl. 77-3i 1.0 '.Claims.

This invention relates to apparatus for internally recessing Asockets in the ends of rotating work-pieces, and is primarily intended-for use in automatic multiple spindle indexing chuck machines to perform the internal recessing of a L stock piece after it has been subjected to and end .boring operation. While the invention is particularly intended for use in connection with ka machine of this character, wherein a stockpiece is carried by and moved to diierent working positions by a rotatable indexing turret lhead, -it vmay be used in a single operation machine where OlllytheA internal recessing operation is performed The primary object of the invention is the provision in a machine of the class described, of simple, eiiicient and improved means for posi.- tively gauging the depth of internal recessing of a Work-piece.

Another object .of the invention is the provision of simple and improved means -for supporting andcontrolling the movements of the tool slide holder 1.11 connection with a cooperating mach-ine.

Further objects and advantages of 4the invention will be apparent from the following detailed description, and from the accompanying drawings illustrating one embodiment thereof, in Whch Fig. 1 is a side elevation of an apparatus embodying the invention, with parts broken .away vand .with the recessing tool positioned in .a work stock bore and centered with respect to its axis, associated operating parts of the machine being fragmentarily shown;

Fig. 2 is a .View looking downward on the recessing apparatus and taken on the line 2 2 lin Fig. 1

Fig. 3 is a cross-section Fig. 1;

Fig. 4 is an end View of such apparatus looking outward on the line 4 4 in Fig. 1, and with a part broken away;

Fig. 5 is a cross-section on the line 5 5 in Fia 1; f

Fig. 6 is a section on the line 6 6 in Fig. 1;

Fig. 7 is a fragmentary section on the line 1 1 in Fig. l;

Fig. 8 is a section on the line 8 8 in Fig. 1;

Fig. 9Ais a perspective view of the tool-carrying bushing;

Fig. l0 is a in which the mounted;

on the line 3 3 in perspective view of the guide block guide rods of the apparatus are perspective view for the tapered Figqlzyis a fragmentary view ofthe work-piece engaging parts inrecessing relation.

In Yautomatic"screwmachinesV or the like, in connection withV which the present recessing means -is particularly intended'for use, the wor-l; stock A (Fig. 1) tobe internally recessed is held by a rotatably driven chuck (not shown) that is mounted -for revo-luble index-ing movementsto successive Iworkin- 1gstations by a turrethead 4(also not shown), as well Vunderstood in the art. The

mounting and control means for the recessin-g tool I, and 4'in which-the features of the present `invention reside, is carriedb-y the customary main tool slide2 of the machine, as shown -in Fig. `1.

-In the illustrated embodiment of the invention, particularly-*asfillustrated in Fig. 1, the tool lis shown ascarriedby aheadwhich-comprises a slide lllmouvntedqfor reciprocatory sliding movements on a-base member 15x-transverse to .the axis of the tool and,r in the present instance, in a vertical plane v which. intersects at right` angles the place of Amovement-of thev slide lf2. The-base member 5 is-of rectangular Iblock form and lhas yon its inner or forward side a dovetail t receiving a vcomplementaltong-ue -1 onl theadjaoent side of the slide I4. .One-side .wall of the groove -6 comprises a longitudinallyacljustable ltapered gib Y This Agib-hasran ear `Slat its large end that is notched Vto receive the-shank of an v-adjiisting screw I0 that is held against axial movements by said ear-andis threadedlinto a registering shoulder` Hof {the-'basemember 5.

The hase member 5, which is generally .oferectangnl'ar.fblockffornr iscarried bytwo guide rods i2, i2 formovements therewith in a plane parallel .to vthe plane of movement of themain slide 2. Y'These rods -iixedly project from the rear side ofthe member 45 andare mounted Aforlongitudinal lmovements.th-roughV a-guidevblock I3, .in the present instance of cylindrical form, that isclamped to :the Amain .slide 2: bya Yspiit bearing lhi.. The rods i2iat the opposite side vof Ythe bearingto-.the member .5'.are conneotedby a cross-.piece I5. and from-:the outer orrear side of this `is projected a single .rod-..l.6. This. rod .extends :loosely through a .spring-thrust .block `l J that fis xedfto Athe. top ofthe slide! :inspacedrelation .to the bearing l, and its outer endrisuprojected .through a `stationary frame v'part |.8 i o1" the. associatedV machine Ifor nlongitudinal .movements therein. A.` lstop nut l9` is .threaded .on-.the rightend for. stop. .engagementwiththeframe par-t IL8-to limit the .ex-tent of inward oriorwardniovementofthe tool carrymounted on the rod I6 between the cross-piece l5 and the block l1. It is thus apparent that a forward or left movement oi the main slide 2 will move the tool carrying unit or head forward therewith to place the tool l in work recessing position with the limit or" such movement determined by the engagement of the stop nut i9 with the frame part IS. Any movement of the slide 2 beyond the stop position is permitted to take place relative to the tool carrying unit by a yielding of the spring 22. The double rod support for the base member is important in preventing chattering.

The tool slide 4 has a stud 25 near its upper end that projects rearwardly therefrom into the upper end portion of a slot or recess 26 provided in the rear side of the base block 5 and closed at its outer or rear side by a plate 21 removably attached to said block. A coiled compression spring 28 is disposed in said recess 26 and bears f at one end sidewise against the stud and at its other end against a shoulder 29 on a tension adjusting screw 30 threaded into the block 5 from an end thereof, as best shown in Figs. l and 5.

The spring 28 presses the stud 25 against a stopscrew 3l that is threaded in the opposite end of the block. The screw 30 has a stem projecting from its inner end into the spring 28 and normally spaced from the stud 25 and serving to limit its movement from normal position. Each i screw 30, 3l is provided with a lock-nut 32.

The tool l is mounted in an eccentric bushing in which it is fixed byr a set-screw 36 and the bushing is mounted in a socket 31 provided in the outer face of the slide 4 near its inner end. A set-screw 38 secures the bushing in the s1ide. A rotary adjustment of the bushing in its recess effects a revoluble adjustment of the tool axis. It is apparent that movements of the tool-carrying unit of the main slide 2 moves the tool axially into and out of a work-piece to be internally recessed and that a movement of the slide 4 transverse to the tool axis and against the tension of the spring 28 moves the tool to off-center or recessing position with respect to the work stock. The recessing, of course, occurs when the tool is at the forward limit of its axial movement and is caused by rotation of the work in side wall engagement with the circumferential cutting portion of the tool. Y

In order that the depth of the recessing may be uniform and of predetermined depth for each work-piece and also for duplicate work-pieces to be subsequently recessed, a work-engaging roll 40 is provided to bear on the outer peripheral surface of the work stock in xed spaced relation to the tool axis and in the plane of transverse movement of the tool, so as to hold the bore of the work recess concentric with the outside diameter of work.

The roll 40 is carried by the forked inner end of a block 4| in predetermined spaced relation to a side of the tool i, and this; block is mounted on a forward projection 42 of the slide 4. The projection 42 is radially spaced from the tool l and may constitute an integral part of the slide 4 or be fixedly attached thereto, as may be desired. The outer side of this projection is provided with a groove radial to the tool axis, and the block 4I is mounted in this groove for adjustment lengthwise thereof. The block 4i is held in adjusted relation to the slide 4 by a clamping screw 43 extending through a longitudinally extending slot 44 therein and threading into said projection. It is thus apparent that the roll 40 is iii) mounted for radial adjustment relative to the tool l and that its carrying block 4l is firmly secured in adjusted relation to the tool slide 4 by the screw 43. The roll 4B is radially spaced from the cutting end of the tool i in the plane of movement of said slide on the base member 5 and has rolling coaction with the work periphery in substantially diametrically opposed relation to the tool to limit the depth of recessing by the tool. An adjusting screw 45 for the roll block is threaded endwise in the slide projection 42 and has an annular flange 46 at its head end engaging in a recess 41 in the inner or adjacent side of the block 4 Automatic machines with which the tool carrying unit embodying the present invention are customarily associated are provided at a side of the stock-carrying parts with a side slide 53 that has a stop pad 5i at its inner end to coa-ct with a stop-screw 52 on a stationary frame part 53 of the machine to limit the extent of inward movement of the slide toward the recessing position oi a work-piece A. The slide 5% is provided at its outer side in radial register with the tool-carrying slide 4 with a bracket 54 carrying an adjusting screw 55 the head of which, on an inward movement of the slide, coacts with a stud 56 on the outer end of the tool slide 4 and moves such slide a distance surcient to oifset the tool to have recessing engagement with the stock wall. This movement of the tool is resisted by the spring 28 acting against the stud 25, so that the cutting pressure of the tool on the work is determined by the spring tension which can be varied by adjustment of the screw 3G, and is limited by engagement of the roll 45 with the work stock periphery.

In multiple chuck machines the inward movement of the slide 53 is timed to take place immediately after the tool i has been moved axially into the work bore, and the slide dwells in its inward stop position during the resisting period. As the slide recedes, or immediately thereafter, the tool is withdrawn from the work bore by outward movements of the main slide In the operation of a machine embodying the invention, it will be understood that the main slide 2, with the parts carried thereby, is in outward retracted position during the period of ieplacing a work-piece in its chuck, or, in the case of an automatic multiple chuck machine, during indexing oi the work to recessing position, -in which position the work and tool stand in axial alignment. The slide 2 is then moved inward the full length of its stroke and this movement causes the base member 5 and parts carried thereby to move inward until the stop i9 on the rod iE strikes the frame part i3, after which the spring 22 compresses and compensates for the continued movement of the slide 2. This lost movement action, or the stopping of the inward or forward movement of the member 5, takes place when the tool i has been moved forward to proper recessing position in the work stock bore. The inward movement of the side slide 50 now takes place to cause the screw 55 to engage the stud 5i; and move the slide 4 with its tool I to stock recessing position radially thereof, This position is maintained until the recessing operation has been complet-ed, The roll 40 is properly spaced with relation to the tool axis, so that it will engage and roll oireumferentially on the work to limit the permissible depth of recessing. The line adjustment of the roll block 4l on the slide 4 for this purpose is accomplished by loosenin g the clamp screw 43 and then turning the screw lili. When the proper adjustment has been obtained, the screw 43 is tightened toV xcdly clamp the roll 4i to the slide 4. The centering of the tool axis with respect to the Work stock axis, or of the bore therein, is accomplished by adjustment of the screw 3l in the base member 5, as this screw acts against the stud and moves it and the tool carrying slide 4 radially of the work stock axis.

We wish it understood that our invention is not limited to any specic construction, arrangement or form or" the parts, as it is capable of numerous modications and changes without departing from the spirit of the claims.

Having thus described our invention, what we claim as new and desire to secure by United States Letters Patent is:

1. In a machine of the class described, having a rotatable work-piece carrying chuck, a main slide movable in parallel relation to the chuck vaxis of rotation, the provision of a tool-carrying head, means mounting said head on said main slide for movements therewith and relative thereto in axial relation to the chuck, said head comprising a body member, and a tool-carrying member guided by said body member and movable relative thereto transverse to the chuck axis, a `rccessing tool carried by said second member for axial movements into and out of the end bore of a Work-piece held `by the chuck when said head is axially moved and movable lateral to the chuck axis to internally recess the bore of a chuck carried work-piece when said second mem- -ber is moved relative to the head, means yieldingly retaining said second member with its tool in axial relation to the chuck, a yielding lost motion connection between said head and slide permitting the slide to have a predetermined extent of inward movement relative to the head, and means for limiting the inward movements of the head relative to the slide, and means for imparting predetermined movement to said second member transverse to the tool axis when the head is at the limit of its inward movement.

2. A combination as called for in claim 1, together with means on the tool-carrying member for engaging a side of a work-piece being recessed to limit the depth of recessing and maintaining the recessing operation concentric with the workpiece axis.

3. A combination as called for in claim 2, wherein said last-mentioned means comprises a slide mounted on said tool-carrying member at a side of the tool for adjustment transverse to the tool axis, and a roll on said slide for rolling engagement with the peripheral surf-ace of a work-piece being recessed to limit the depth of recessing by the tool and to maintain the recessing operation concentric with the work-piece ax1s.

4. In a machine or the class described having a revolubly movable chuck-carrying part with a rotatably driven chuck, and a main slide movable axially of the chuck, the provision of a toolcarrying head including a body member and a slide member carried by the body member and movable relative thereto transverse to the chuck axis, a tool carried by said slide member for movement therewith axially of the chuck into and out of the end bore of a work-piece held by the chuck and also for Work recessing movements transverse to the chuck axis, means connecting the slide and body members and acting to yieldingly hold the former with its tool co- 4axial with the chuck axis, means at a side ofvsaid head opera/ble to move the Vslide member from normal position relative to the body member to cause an off-center recessing operation ofthe tool withrespect to the Work-piece carried by the chuck when said .chuck-carrying part is -at a predetermined point in its revolublc vmovement, `and lost-motion connection between said main slide and tool-carrying head for imparting predetermined `movements from vone to the other axially of the chuck.

v5. A combination as `called for `in claim 4, wherein said last-mentioned connection comprises-a guide means projecting from the opposite side of said head member to said slide member, means mounting said guide means on said main slide for movement `therewith and relative thereto parallel to the chuck axis, stop means for limiting the inward movements of saidguide means and head toward the chuck, and cushion means between said guide means and main slide permitting a predetermined continuation of the inward movement of the main slide after a stopping of the inward movement ci said guide means by said stop means.

`6. Ina .machine ofthe class described, having .a rotatable Work-piece carrying chuck, the provision of a tool-carrying head, means mounting .said head for reciprocatory movements axially of said chuck, said head comprising a body member axially movable relative tothe chuck and a toolcarrying member movable with said body member and guided thereby for relative movements transverse to the chuck axis, a recessing tool carried by said second member for axial movements into and out of the end bore of a work-piece held bythe chuck when said head is axially moved and is movable laterally to the chuck axis to internallyrecess the work-piece bore when said second member is move-d relative to the head, means normally retaining said second member with its tool in axial relation to the chuck, means for imparting predetermined reciprocatory movements to the head axially of the chuck and permitting it to dwell in recessing position, and means opera-ble to impart predetermined lateral movements to said tool and second member to recess the bore of a Work-piece carried by the chuck, said head mounting means including a guide on and movable Wth .the mounting means for imparting reciprocatory movements to the head, and a plurality of laterally spaced guide rods projecting from the head and reciprocably movable in and guided by-said guide.

7. In a machine of the class described, having a rotatable work-piece carrying chuck, the provision of a tool-carrying head, means mounting said head for reciprocatory movements axially of said chuck, said head comprising a body member axially movable rela-tive to the chuck and a tool-carrying member movable with said body member and guided thereby for relative movements transverse to the chuck axis, a recessing tool carried by said second member for axial movements into and out of the end bore of a work-piece held by the chuck when said head is axially moved and is movable laterally to the chuck axis to internally recess the work-piece bore when said second member is moved relative to the hea-d, means normally retaining said second member with its tool in axial relation to the chuck, means for imparting predetermined, reciprocatory movements to the head axially of the chuck and permitting it to dwell in recessing position, and means at a side of the head operable to impart predetermined lateral movements to said tool and second member to recess the bore of a work-piece carried by the chuck, said head mounting means including a guide on and movable with the means for imparting reciprocatory movements to the head, guide means projecting from the head and mounted in said guide to guide the movements of the head, means coacting with said guide means to limit the movement of the head toward the chuck, and a spring connection between said guide means and the means for imparting said axial movements to the head permitting the head to dwell during the predetermined inward movements of said last-mentioned means.

8. In a machine of the class described having a chuck-carrying part with a rotatably driven chuck, and a main slide movable axially of the chuck, the provision of a tool-carrying head including a body member and a slide member carried -by the body member and movable relative thereto transverse to the chuck axis, a tool carried by said slide member for movement therewith axially of the chuck into and out of the end bore of a work-piece held by the chuck and also for work recessing movements transverse to the chuck axis, meansl connecting the slide and body members and acting to yieldingly hold the former with its tool coaxial with the chuck axis, means operable to move the slide member from normal position relative to the body member to cause an off-center recessing operation of the tool with respect to the work-piece carried by the chuck, and connection between said main slide and tool-carrying head for imparting predetermined movements from one to the other axially of the chuck, said last-mentioned connection including a guide xed on the main slide, a plurality of parallel guide rods projecting from said head member in parallel relation to the movement of said main slide and having longitudinally guided sliding engagement with said guide, together with a cushion connection between said main slide and guide rods permitting predetermined inward stroke movements of the main slide relative to the guide rods, and means stopping the inward movement of the guide rods at a predetermined point in the corresponding movement of the main slide.

9. In a machine of the class described having a revoluble chuck-carrying part with a rotatably driven chuck, and a main slide movable axially of the chuck, the provision of a tool-carrying head, means mounting the head on said main slide for movements therewith and yielding lost motion movements relative thereto, said head including a body member and a slide member mounted on a side of said body member for guided movements transverse to the movements of said main slide, means normally holding said slide member at one end of its said transverse movement, a tool carried by said slide member and normally standing in axial register with said chuck, and means at a side of said head in transversely spaced relation to the tool axis and periodically operable to move said slide member and tool transverse to the chuck axis for side recessing a work-piece carried by the chuck.

l0. In a machine of the class described having a revoluble chuck-carrying part with a rotatably driven chuck, and a main slide movable axially of the chuck, the provision of a tool-carrying head, means mounting the head on said main slide for movements therewith and yielding lost motion movements relative thereto, said head including a body member and a slide member mounted on a side of said body member for guided movements transverse to the movements of said main slide, means normally holding said slide member at one end of its said transverse movement, a tool carried by said slide member and normally standing in axial register with said chuck, and means at a side of said head in transversely spaced relation to the tool axis and periodically operable to move said slide member and tool transverse to the chuck axis for side recessing a work-piece carried by the chuck, a block carried by said slide member at its outer side relative to said body member, and a pressure backing roller carried by said block in opposed transversely spaced relation to said tool for side engagement with a work-piece being acted on when the slide member is moved a predetermined extent from normal position relative to the body member.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,449,475 Wheeler Mar. 27, 1923 1,820,056 Drowns Aug. 25, 1931 

